Fighters of the Islamic State of Iraq and the Levant stand guard at a checkpoint in the northern Iraq city of Mosul on June 11. Photo: Reuters

Bloodthirsty Iraqi jihadists posted a photo of a Sunni police chief’s decapitated head online — along with a twisted joke about using it as a soccer ball at the World Cup on Friday.

“This is our ball . . . It is made of skin #WorldCup,” the radical Islamic State of Iraq and Syria tweeted with the grisly image.

The Islamic militant group has been turning to social media to boast of its victories as its fighters continue to seize large swaths of the country.

The propaganda efforts — meant to shatter the morale of Iraqi government officials and strike fear into the heart of civilians — have been wildly successful in the country, The Washington Post reported.

The al Qaeda-inspired group, which has also performed horrifying executions and amputations, also posted video footage of the beheading.

In the gruesome clip, the militants knock on the door of the police officer’s home in the middle of the night.

After he answers, they blindfold him, cuff him — and cut off his head with a knife.

Another video clip the group posted online shows them leaning out of cars, spraying drivers with bullets along a blood-splattered street.

A propaganda video posted online shows the victim before and after the gruesome execution.

In another posted video, the militants are seen abducting a pro-government militia commander and his two sons, forcing them to dig their own graves, then slitting their throats.

“I advise whoever is with the Sahwa to repent and quit,” a militant leader says to the camera, referring to the pro-government Sahwa militia.

Another clip shows the fighters disguised as soldiers at a checkpoint, stopping cars before killing Shiites by the side of the road.

On Tuesday, the militants also tweeted a photo of themselves bulldozing a path to Syria in an offensive meant to create a united Islamic state.

The Islamic State of Iraq and Syria claims to have killed more than 1,700 Iraqi soldiers and police officers in its violent attempt to take control of the Iraqi capital, Baghdad.

More than 500,000 Iraq residents fled during the takeover —in a sign the group’s fear tactics are working.